Concrete core form



June 21, 1960 w. GOODLAD CONCRETE CORE FORM Filed Sept. 17, 1957 INVENTOR A my/mm L. Good/a0 ATTORNEY United States Patent F CONCRETE CORE FORM William L. Goodlad, 110 W. Sixth St.,

New Richmond, Wis.

Filed Sept. 17, 1957, Ser. No. 684,476

Claims. (Cl. 25-128) This invention relates to an improvement in concrete forms and deals particularly with a form useful in the construction of a hollow wall containing cavities which an inexpensive form which may be used in the construction of a concrete building having walls which are at least partially hollow thereby conserving the cement and providing a wall possessing high insulating properties.

A further feature of the present invention resides in the provision of a concrete form including a pair of end members and a pair of connecting members between the end members. The end members are tapered in form and are wider at the top than at the bottom so that these end members may be withdrawn from the body of concrete thus disconnecting the four sections of the mold whereupon the connecting sections may also be easily removed.

A further feature of the present invention resides in the provision of a concrete form having sections which interlock together to hold the various parts from lateral or longitudinal movement relative to one another. At the same time the connection is such that the end sections may be separated from the intermediate or connecting sections by an upward vertical movement.

A further feature of the present invention resides in the provision of a concrete form including a pair of trapezoidal connecting panels which are wider at their lower edges than at their upper edges, the upper and lower edges being parallel. The end sections are generally U-shaped or channel-shaped in form and are tapered, the sides of the U-shaped members being wider at their upper edges than at their lower edges so that when the parts are assembled, a form is provided which is of uniform cross sectional shape throughout its height.

A further feature of the present invention resides in the fact that the connecting members may, if desired, be angular so as to extend about a corner of the wall where it is so desired. In other words, the connecting members may be bent along a vertical line intermediate their ends so that one end of the intermediate panel is at right angles to the other in which case the outer connecting member is sufiiciently longer than the inner member to form a right angular aperture in the wall.

These and other objects and novel features of the present invention will be more clearly and fully set forth in the following specification and claims.

In the drawings forming a part of the specification:

Figure 1 is a perspective view of three of the four parts of the mold, the fourth part being omitted so that the remaining parts may be more readily viewed.

2,941,276 Patented June 21, 1960 Figure 2 is a top plan view of a section of a wall being formed by the forms.

Figure 3 is a perspective view of a portion of a spacer used in conjunction with the form.

Figure 4 is a cross-sectional view through a portion of the form showing the cover used in conjunction therewith.

Each of the concrete forms is formed of four main parts, three of which are indicated in general by the letter A in Figure 1 of the drawings. The form A includes two end forming members 10 and 11 which are identical in form, one being reversed with respect to the other. The form A also includes a pair of connecting panels 12, one of which is shown in Figure 1 of the drawings and both of which are identical in actual practice.

Each of the end forming members 10 and 11 comprise a structure which is channel shaped in horizontal section. Each end forming member includes a base portion 14 which forms the end wall of the aperture and a pair of parallel side wall portions 15 and 16. In the particular arrangement illustrated, the base wall 14 is somewhat curved so as to form a slightly rounded end to each of the apertures. Obviously, in place of being curved throughout its width, the base wall 14 could be flat and could be connected to the side wall portions 15 and 16 along a curved arc of connection to the edges 17 and 19 so that the connecting panels 12 are symmetrical in form.

A pair of angular lugs 22 and 23 are welded or otherwise secured to the inner surface of the connecting member 12 adjoining the edge 20 thereof. Each of the clips includes an anchoring flange 24 which is secured in surface contact with the surface of the connecting member 12, and each clip also includes a right angularly extending horizontal flange 25. Each flange 25 is provided with an aperture 26 extending therethrough for a purpose which will be later described.

A similar pair of clips 27 and 29 are secured to the connecting member 12 near the edge 21 thereof. Each of these clips 27 and 29 includes a vertical anchoring flange 30 which is welded or otherwise secured to the inner surface of the connecting member 12 and a right angularly extending flange 31 which extends on a generally horizontal plane. Each flange 31 is apertured as indicated at 32.

The side portions 15 and 16 of the end members 10 and 11 are provided with relatively narrow lower edges 33 and relatively wider upper edges 34. Inclined edges 35 connect the lower and upper edges 33 and 34 and the angle of these edges relative to a horizontal plane is similar to the angle of the edges 20 and 21 of the connecting members 12. As a result, when the edges 35 abut the edges 20 and 21 of the connecting members 12 the cross section of the form will be constant throughout its height.

The parallel side portions 15 and 16 of the end members 10 and 11 are provided with an upper pair of angle brackets 36 and a lower pair of angle brackets 37. The upper angle brackets 36 include anchoring flanges 39 which are spot welded or otherwise secured to the inner surface of the side wall portions 15 and 16 adjoining the inclined edges 35 thereof. These upper angle brackets 35 also include horizontal flanges 40 which are arranged on a common plane slightly above the plane of the horizontal flanges 25 and 31 of the upper angle brackets 22 and 27 of the connecting members 12. The arrangement is such that when the flanges 40 rest upon the flanges 25 and 31 of the angle brackets 22 and 27 respectively, the upper edges 34 of the end member are on the same plane as the upper edges 19 of the connecting sections and the lower edges 33 are on the same plane as the lower edges 17 of the connecting sections.

Theflanges 40 project beyond'the inclined edges 35 of i the 'end members a distance suflicient to overlie the flanges 25 and 31 when the edges are in abutting relation. Downwardly projecting lugs 41, which arepreferably tapered at their lower ends, fit withinthe apertures 26 and 32 of the upper brackets22 and 27 of the connecting members E2.

The lower angle brackets 37' are similarlyconstructed and include anchoring flanges '42 secured in surface contact with the sideportions 15 and 16 of the end members 14 and include horizontal flanges 43 which extend in a common plane beyond the inclined edges 35 so as to overlie the horizontal flanges 25 and. 31 of the lower angle brackets 23 and 29 of the connecting member 12. Downwardly extending lugs or projections 44 are designed to extend through the apertures 26 and 32 of thelower angle brac iEtS 23 and 29 when the edgesof the end sections are in abutting relation to the inclined edges 20 and 21 of the connecting sections 12.

In assembling the form, a pair of connecting sections '12 are placed in parallel relation and the end sections and 11 are connected thereto by hooking the various lugs such as 4-1 and 44 of the angle brackets 36and 37 into the corresponding apertures 26 and 32 of the connecting sections 12. When thus assembled, the end walls 14- extend vertically as do the connecting sections 12 so that the form is of similar cross sectional area throughout its height.

As is indicated in Figure 2 of the drawings, in building a wall, parallel panels 45 and 46 of plywood or other suitable material are erected and are connected in any conventional manner, as by wires 47 connecting reinforcing uprights 49 outwardly of the panels. These wires 47 extend through the panels 45 and 46, extend between the ends of the forms A, and are embedded in the concrete. In order to prevent the likelihood of separation between the spaced Wall portions, bolts such as 48* are placed at frequent levels between the ends of adjacent forms and are embedded in the concrete as the concrete is poured. The heads and nuts on these bolts serve as anchors to reinforce the wall against splitting vertically between the inner and outer wall portions.

As indicated in Figure 2 thecorners of the walls may also be hollow if desired by merely changing the shape of the connecting members 12. Figure 2 shows an inner form panel 56 and an outer form panel 51 secured in right angnllar relation to the panels 45 and 46. A right angular inner connecting member 52 is provided which includes a right angular bend 52 intermediate its end edges. An outer connecting member 54 is also provided which is right angularly bent at 54' intermediate its ends. In such an arrangement, it is necessary that-the outer connecting member 55 be correspondingly longer than the inner connecting member 52 in order that the ends of the connecting members be on a common inclined plane. With this exception, the connecting members are identical to those previously described, the ends of the angular form members 52 and 54 being inclined and the end members It) and 11 being identical to those previously described.

The forms A remain in the wall until the concrete has set but are normally removed before the concrete isv completely dry and hardened. The forms are removed by first removing the end members 10 and 11 and next removing the connecting members 12. The parts of each form are reassembled and telescoped into the opening which they have formed and additional side panels such as 45, 46, 5d and 5,1 are added. Before the concrete is completely dry, a next layer is preferably applied so that the layers will firmly bond together. Thus, during the formation of the wall, the forms A are merely moved upwardly until the walls are completed.

The members 12 are held from collapsing inwardly under pressure of the concrete by spacers of the type shown in Figure 3. These spreaders comprise vertically elongated spacing bars 53 having parallel sides such as '53 and arcuate ends '55 and 56. A vertical rod'57 extends upwardly from the center of each spacer bar and is provided with a cross bar 59 at its upper end forming a handle by means of which the spacer may be turned so that the arcuate end walls move into or out of engagement with the inner surfacesof the members 12.

Each spacer is supported by a cross arm 60 loosely mounted on the rodf57 so as to permit rotation or turning of said rod thereinand held near the upper end of the spacer bars 53by a collar 61 on the rod 57. The ends 62 of the cross arm 60 are preferably bent downwardly to engage over the edges of the mold. When the arcuate ends of the barlengage the inner surfaces of the members 12, they prevent the members'12 from flexing inwardly due to the weight of concrete. When the concrete has set sufficiently, the spacers may be removed by turning the bars 53 about theirvertical axis by the handle member 59. As the parallel sides 54 are spaced apart a distance less than the arcuate ends 55 and56, the spacers maybe readily removed upon rotation thereof.

Covers such as 63 including a cover panel 64 and a depending peripheral skirt 65 may be placed over the forms A while the concrete is poured, preventingconcrete from entering theforms. In accordance with the patent statutes, I have described the principles of construction and operation of my improvement in concrete forms, and while I have endeavored to set forth the best embodiment thereof, I desire to have it understood that changes may be made within the scope of the following claims without departing from the spirit of my invention.

I claim:

1. A concrete form including a pair of end sections and apair of connecting sections, the connecting sections being formed with parallel upper and lower edges and upwardly and inwardly inclined end edges, the end sections being channel-shaped in horizontal cross section, the sides of the channel-shaped end sections being generally parallel and the edges of thesesides being inclined to fit the inclination of the side edges of the connecting sections, and interconnecting means on said end sections and said connecting sections to hold the same in edge abutting relation, said interconnecting means being disconnectable upon upward vertical movement of said end-sections relative to said connecting sections.

2. A concrete form including a pair of end sections and a pair of connecting sections, the connecting sections being formed with parallel upper and lower edges and upwardly and inwardly inclined end edges, the end sections being channel-shaped in horizontal cross section, the sides of the channel-shaped end sections being generally parallel and the edges of these sides being inclined to fit the inclination of the side edges of the connecting sections, and interconnecting means on said end sections and said connecting sections .to hold the same in edge abutting relation, said interconnecting means including apertured plates extending inwardly from said connecting sections and brackets projecting from the edges of said end sections and including downwardly projecting lugs engageable in said apertures.

3. A concrete form including a pair of end sections and a pair of connecting sections, said connecting sections being trapezoidal in outline with the parallel edges forming the upper and lower edges thereof with the longer parallel edge lowermost, a pair of angle brackets secured to the inner surface of each connecting section near each inclined edge thereof, said angle brackets including substantially horizontal flanges having apertures therethrough, said end sections being channel-shaped in horizontal section and having substantially parallel sides provided with inclined edges to fit the incline of the inclined edges of the trapezoidal sections and so that when the edges of the end sections abut the edges of the connecting sections the structure is of the same crosssectional shape throughout its height, the sides of said end sections including angle brackets projecting beyond the edges of these sides, said last named angle brackets being designed to rest upon the horizontal flanges of the connecting sec tions and said last named angle brackets including downwardly extending projections engageable in the apertures of said connecting sections.

4. A concrete form including a pair of end sections and a pair of connecting sections, the connecting sections being formed with parallel upper and lower edges and upwardly and inwardly inclined end edges, the end sections being channel-shaped in horizontal cross section, the sides of the channel-shaped end sections being generally parallel and the edges of these sides being inclined to fit the inclination of the side edges of the connecting sections, and interconnecting means on said end sections and said connecting sections to hold the same in edge abutting relation, and spacers supported between said connecting sections, said spacers each comprising a cross arm having downwardly bent ends for overlying support on the upper edges of said connecting sections and a substantially vertical bar substantially equal in width to the distance between said connecting sections and being narrower in thickness, said vertical bar being rotatably carried on said cross arm for rotation upon a substantially vertical axis.

5. The structure of claim 4 and in which the sides of said spacers are parallel and of arcuate configuration.

References Cited in the file of this patent UNITED STATES PATENTS 1,437,297 Engert Nov. 28, 1922 1,452,751 Nelson Apr. 24, 1923 1,517,879 Watson Dec. 2, 1924 1,593,771 Linthwaite July 27, 1926 1,597,163 Krump Aug. 24, 1926 2,148,815 Jakobsen Feb. 28, 1939 2,733,495 Lucas Feb. 7, 1956 FOREIGN PATENTS 226,604 Germany Oct. 6, 1910 

